<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <link rel="stylesheet" href="./css/inputnumber.css"/>
    <link rel="stylesheet" href="./css/index.css"/>
    <title>购物车</title>
</head>
<body>
<div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="./img/fruit.jpg" alt=""/></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length>0">
        <div class="table">
            <!-- 头部 -->
            <div class="thead">
                <div class="tr">
                    <div class="th">选中</div>
                    <div class="th th-pic">图片</div>
                    <div class="th">单价</div>
                    <div class="th num-th">个数</div>
                    <div class="th">小计</div>
                    <div class="th">操作</div>
                </div>
            </div>
            <!-- 身体 -->
            <div class="tbody">
                <div v-for="(item,index) in fruitList" :key="item.id" class="tr" :class="{active:item.isChecked}">
                    <div class="td"><input type="checkbox" v-model="item.isChecked"/></div>
                    <div class="td"><img :src="item.icon" alt=""/></div>
                    <div class="td">{{item.price}}</div>
                    <div class="td">
                        <div class="my-input-number">
                            <button class="decrease" @click="sub(item.id)"> -</button>
                            <span class="my-input__inner">{{item.num}}</span>
                            <button class="increase" @click="add(item.id)"> +</button>
                        </div>
                    </div>
                    <div class="td">{{item.price * item.num}}</div>
                    <div class="td">
                        <button @click="del(item.id)">删除</button>
                    </div>
                </div>
            </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
            <!-- 全选 -->
            <label class="check-all">
                <input type="checkbox" v-model="isAll"/>
                全选
            </label>
            <div class="right-box">
                <!-- 所有商品总价 -->
                <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span
                        class="price">{{totalPrice}}</span></span>
                <!-- 结算按钮 -->
                <button class="pay">结算( {{totalCount}} )</button>
            </div>
        </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
</div>
<script src="./vue.js"></script>
<script>
    const defaultArr = [
        {
            id: 1,
            icon: './img/火龙果.png',
            isChecked: true,
            num: 2,
            price: 6,
        },
        {
            id: 2,
            icon: './img/荔枝.png',
            isChecked: false,
            num: 7,
            price: 20,
        },
        {
            id: 3,
            icon: './img/榴莲.png',
            isChecked: false,
            num: 3,
            price: 40,
        },
        {
            id: 4,
            icon: './img/鸭梨.png',
            isChecked: true,
            num: 10,
            price: 3,
        },
        {
            id: 5,
            icon: './img/樱桃.png',
            isChecked: false,
            num: 20,
            price: 34,
        },
    ]

    const app = new Vue({
        el: '#app',
        data: {
            // 水果列表
            fruitList: JSON.parse(localStorage.getItem("list")) || defaultArr,
        },
        methods: {
            del(id) {
                this.fruitList = this.fruitList.filter(item => item.id !== id)
            },
            add(id) {
                // 1.根据 id 找到数组中的对应项
                const fruit = this.fruitList.find(item => item.id === id);
                // 2.操作 num 数量
                fruit.num++
                console.log(fruit)
            },
            sub(id) {
                // 1.根据 id 找到数组中的对应项
                const fruit = this.fruitList.find(item => item.id === id);
                // 2.操作 num 数量
                fruit.num--
                console.log(id)
                if (fruit.num === 0) {
                    console.log("数量=0")
                    this.fruitList = this.fruitList.filter(item => item.id !== fruit.id)
                }
            }
        },
        computed: {
            isAll: {
                get() {
                    return this.fruitList.every(item => item.isChecked === true)
                },
                set(value) {
                    console.log(value)
                    this.fruitList.forEach(item => item.isChecked = value)
                }
            },
            // 统计选中总数
            totalCount() {
                return this.fruitList.reduce((sum, item) => {
                    if (item.isChecked) {
                        return sum + item.num
                    } else {
                        return sum
                    }
                }, 0)
            },
            // 统计选中总价
            totalPrice() {
                return this.fruitList.reduce((sum, item) => {
                    if (item.isChecked) {
                        return sum + item.num * item.price
                    } else {
                        return sum
                    }
                }, 0)
            }
        },
        watch: {
            fruitList: {
                deep: true,
                handler(newValue) {
                    console.log(newValue)
                    // 将 newValue 存到本地（转 JSON）
                    localStorage.setItem("list", JSON.stringify(newValue))
                }
            }
        }
    })
</script>
</body>
</html>
